System of electric-current distribution



, May 26, 1925.

' '-C- A. TURNER s'ir's'rm or" ELECTRIC CURRENT msmmunou Filed M226, 1924 Patented May 26, 1925.

umree stares mrsnr snooe CHARLES A. TURNER; OF'MADIS ALQWTEiGQNSIN, ASSIQNORJ' TD-GIfiHOLTIMACHII TEF COMPANY, OF MADISON, .EVISGON' SIN, A GOBRG-R-ATIONQE WISCONSIN.

SYSTEM OF ELECTRIC/@UR-RENT DISTRIBUTION.

Application filed May-26, 1924.; Serial No. 715,943.

To all whom it may, concern:

Be it known that I, .GHARLES A. TURNER, acitizenof the Unlted States, residing at Madison, in the coun State of lvlsconsrn, new and useful Imp ElectriceCurrent Distrib following is a full,

description.

My invention rela current distribution vision of impr and ty of Dane and the have invented a certain rovement in Systems of ution, of which the. clear, concise, and exact tes to systems of electric resides in the prooved means for supplying current to translating devices atlow voltage from circuits furnishing translating devices at high voltage. system of my inventlon,

curent to other The for example, on-

ables the operation of house bells-by current supplied from commercial, house, lighting C11'Cl11l3S..

The system embracing clusive resistance in brid ing; two sections. an energizing winding and aholding wind:

terminal .my invention is inof. asource of current,,a sectional ge. ofthe mains and includin. series, a-rel having 5 ing, one terminal of theenergizin-g; winding being connected by a conductor. resistance. secti the relay having the remaining between said one, the armature switch, of one contact connected with of the energizing ending, two additional contacts, and an added contact. connected with one, main and connectable with said additionalcontacts When the relay is; energized,

one. offthe additionalcontacts. being, connected with one terminal ofthe llbldlllgiWlllCllllgfllld normal to the. first relay contact and separable therefrom. when the relay is energized, a

second. resistance. in circuit of these additional. contacts with the other i-andfthe other main,.a third resistance in circuitwithsaid addedcontact andthe main with which this contact is connected, a.

supply conductor connected through the holding,xviiidiligjwitli the second resistance a which the second resis when the. relay is energ ply conductor connect main, the second connected serially the sectional. resistance nd the main with tance is connected .ized, a second suped with the other and third resistances being I and together. in

shuntfof when the relay is energized, a responsivedevice, and-a switch for connecting the through said responsive winding to brmgthe responsive device and hol ding, winding in shu pply conductors device and holding nt of. the. thirdre sistance when this switch isclosed and the relay. is energized. The third resistance delines the manimuni reduced voltage for the responsive device. 'This voltage may be variedzbelow this maximumby an adjustable resistance in shunt of the thirdresistance.v

In. lighting systems it is, common to ground one line circuit side or, ifthe system is a threewire system, to" ground the neutral conductor. thereof. This grounding is ef fected at'the generator. Fire underwriters, rules provide that instruments connected with such a grounded system be not themselves permanently grounded t'hereat; this precaution being takento avoid electrolytic action.

The invention has for jects the provision of a which. applies ground to inginstrument While is thus guarded against the efiects'resulting from partial grounds accidently appliedto the side ofsuch circuit that should be connected with the ungrounded side of the lighting'circuit.

he accompanying drawings shows the preferred embodiment of the invention, Fig. 1 illustrating the. preferredcircuit arrangement in its idle condition andFig. 2 illustrating, the. system in operation.

The suppl mains l and 2; convey" current impressed thereonat the higher pressure, say- 1l0.volts, by the directcurrent'or other generator. 3 to supply incandescent lampsl or other load... v y

The supply main 1. is grounded. at the grounded pole of said source. A sectional resistance is in. bridge of the, mains, this resistance having three sections 4, 5 and 6 in series,-these resistance sections being preferably incandescent lamps. A relay 7 is in shunt of two of said resistance sections 5 and 6 taken together. Thearmature switch of the relay has a contact 8 connected with the grounded main and a grounded contact 9 that is connected with the groundedmain throughthe aforesaid contact 8" and, the

armature when the relay is deenergized. The armature switch has an alternate contact 11 connected between the resistance sections 5 anl 6 and a second alternate contact 12. A second relay has an energizing winding 13 and a holding winding 141:, the afore said second alternate contact 12, being connected with one terminal of the energizing winding. The armature switchof the second relay has one contact 15 connected with the remaining terminal of said energizing winding, two additional contacts 16, 17 and also an added contact 18 which is connected with main 1 and connectable with said addi tional contacts 16, 17 when the second relay is energized. The additional contact 16 is connected with one terminal of the holding winding and is normal to the relay contact 15 and separable therefrom when the second relay is energized. A second resistance 19 is in circuit with the other additional contact 17 and the other main 2.

A third resistance 20 is in circuit with main 1 and said added contact 18 to define the maximum reduced voltage. An adjustable resistance 21, in shunt of the third resistance 20, serves to adjust the reduced voltage below the maximum. A supply conductor 22 is connected through this winding with the second resistance 19 and the main '2 with which the second resistance. is connected when the second relay is energized. A second supply conductor 23 is connected with the other main 1, the second and third resistances 19, 20, being connected serially and together in bridge of the mains 1 and 2 when the second relay is energized. A. normally open bridge 21 is connected between said supply conductors 22, 23, a responsive device 25 being in said bridge, as is also a switch 26 for closing the bridge. The holding winding and responsive device are preferably in series and together in shunt'of the resistance 20 when switch 20 is closed and the second relay is energized.

\Vhen the energizing circuit 13, 15, 16, etc. of the second relay is broken at 15, 16 upon energization of this rel ay,'the relay is maintained sufliciently energized to hold its armature, while the switch 26 is closed, by means of the holding winding 14: whose cirouitis closed by the switch 26. Vhen this switch is opened, the apparatus is restored from the used condition shown in Fig. 2 to the idle condition shown in Fig. 1.

In connecting the voltage reducing instrument with the mains, the terminals 27, 28 of the instrument should be respectively con nected with the mains 1 anl 2. If the voltage reducing instrument is reversely, wrongly, connected with the line, that is, has its terminals 27 28 respectively connected with the mains 2 and 1, a fuse blowing circuit is established traceable from the grounded generator 3, through the main 1, and fuse 29 (which bec mies blown), instrument terminal 27, the released armature 10, and the contacts 8 and 9 that are engaged by the released armature, to ground. The wrong connections have blown fuse has to be replaced in order to maintain the connection of the instrument with the mains intact.

The instrument will be inoperative if it becomes reversely connected with the line due to the transposition of the mains of the lighting circuit following the closing of such circuit after it has been opened, since the fuse 29 would become blown to lreep the circuit of the guarding magnet 7 closed. The translating device 25 cannot, therefore, be operative until the instrument has been correctly connected with the line and a new fuse supplied to replace the one that had become blown.

One setof values is noted upon the drawingz. Others may be chosen.

Changes may be made without departing from my invention.

Having thus described my claim 2 1. A system of electric current distribution including a source of current; supply mains in circuit with said source of current; a sectional resistance and including two sections in series; a relay having an energizing winding and a holding winding and having a conductor connecting one terminal of the energizing winding between saidresistance sections, the armature switch of the relay having one contact connected with the remaining terminal of the energizing winding. two ad litional contacts, and an added contact connected with one main and connectable with said additional contacts when the relay 1s energized, one of the additional contacts being connected with one terminal of the holding winding and normal to the first relay contact and separable therefrom when the relay is energized; a second resistance in circuit. between the other of these additional contacts and the other main; a. third resistance in circuit between said added contact and the main with which this contact is connected; a supply conductor connected through the holding winding with the second resistance and the main with which the second resistance is connected when the relay is energized; a second supply conductor connected with the other'main, tie second and third resistances being connected serially and together in shunt of the sectional resistance when the relay is energized; a responsive device; and a switch in series with the responsive device and with the holding winding for connecting the supply conductors through said responsive device and holding winding, the responsive device and holding winding invention, 1

being in shunt of the third resistance when to be reversed and the from being in bridge of the mains this switch is closed and the relay is energized.

2. A system tion including grounded pole;

of electric current distribua source of current havinga supply mains in circuit with said source of current, one of these mains being grounded at the grounded pole of said source; a sectional resistance in bridge of the mains and having three sections in series; a relay in shunt of two of said resistance sections taken together and having a grounded contact that is connected with the grounded main by the armature switch of the relay when the relay is deenergized, an alternate contact between and connected with said two resistance sections, and a second alternate contact; a second relay having an energizing winding and a holding winding, the aforesaid second alternate contact being connected with one terminal of said energizing winding, the armature switch of the second relay having one contact connected with the reniaining terminal of said energizing winding, two additional contacts, and an added contact connected with one main and connectable with said additional contacts when the second relay is energized, one of these additional contacts being connected with one terminal of the holding winding and normal to the first, second relay contact and separable therefrom when the second relay is energized; a second resistance in circuit with the other of these additional contacts and the other main; a third re sistance in circuit with said added contact and the main with which this contact is con nected; a supply conductor connected through the holding winding with the second resistance and the main with 'which the second resistance is connected when the second relay is energized; a second supply conductor connected with the other main, the second and third resistances being con-' nected serially and together in shunt of the sectional resistance when the energized; a responsive device; and a switch in series with the responsive device and with the holding winding for connecting the supply conductors through said responsive device and holding winding, the responsive device and holding winding being in shunt ot' the third resistance when this switch is closed and the second relay is energized.

In witness whereof, I hereunto subscribe my name.

CHARLES A. TURNER.

second relay is 

